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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
If you weren't wedded to SD cards there's also http://www.espruino.com/DS2xxx
These are tiny little 3 wire devices which could easily be pushed into a bit of 0.1" socket. They don't hold a lot of data but potentially 2.5kB would hold enough JSON?
But then you'd need the use another Espruino to program them - SD cards are definitely easy to program from a bunch of platforms :)